Thanks! It made me have another look.
The Blackpool link for certificates should be the right one:
"We also hold records for some other parts of the Fylde Coast:
We have records for births and deaths which took place between 1837 and 1899 in Fleetwood, Poulton-Le-Fylde and Thornton-Cleveleys as well as Blackpool
All Fylde Coast Register Office marriages from 1837 to 1936
Marriages in Fylde Coast churches (other than Church of England) from 1837 to 1898 and
Marriages in some Fylde Coast churches (other than Church of England) from 1899 to 1936.
If you would like more information about this or you are in doubt about where an event took place, please ring 01253 477177 for help.
It may help your application for family history certificates if you look first at www.lancashirebmd.org.uk
to find a reference for the event and add the information to your online application in the box marked Lancashire BMD."